Heavy metals
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Heavy metals is a controversial and ambiguous term for metallic elements with relatively high densities, atomic weights, or atomic numbers. The criteria used, and whether metalloids are included, vary
Crystals of osmium, a heavy metal nearly twice as dense as lead
In a cello (example shown above) or a viola the C-string sometimes incorporates tungsten; its high density permits a smaller diameter string and improves responsiveness.
Cerium(IV) oxide is used as a catalyst in self-cleaning ovens.
Neodymium sulfate (Nd2(SO4)3), used to colour glassware
Metal
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A metal is a material that, when polished or fractured, shows a lustrous appearance, and conducts electricity and heat relatively well. These properties are all associated with having electrons availa
Iron, shown here as fragments and a 1 cm3 cube, is an example of a chemical element that is a metal.
Metal in the form of a gravy boat made from stainless steel, an alloy largely composed of iron, chromium and nickel
Gallium crystals
Battery demonstration unit for conducting polymers built by nobel laureate Alan MacDiarmid